"The ECS A780GM-A Ultra motherboard that we are looking at today is a full-size ATX mainboard that is part of the "Black Series." It sports the AMD 780G Chipset coupled with the SB750, which has proven to be a very competitive and great performing combination. The SB750 chipset by AMD supports Advanced Clock Calibration (ACC), a new feature which can allow for higher overclocks on Phenom and Phenom II processors due to some internal adjustments that AMD engineers have done that involves connecting unused pins on the Phenom CPU to the SB750 Southbridge in order to change the CPU's internal timings. This will make it easier to reach some of the higher overclocks long desired by Phenom owners. The ECS A780GM-A uses the SB700 chipset, and the ECS A780GM-A Ultra uses the SB750, so if you want ACC be sure to get the ECS A780GM-A Ultra, which is what we are looking at here today..."